EP3753644A1 - Roll-forming machine and method for roll-forming - Google Patents
Roll-forming machine and method for roll-forming Download PDFInfo
- Publication number
- EP3753644A1 EP3753644A1 EP19181268.4A EP19181268A EP3753644A1 EP 3753644 A1 EP3753644 A1 EP 3753644A1 EP 19181268 A EP19181268 A EP 19181268A EP 3753644 A1 EP3753644 A1 EP 3753644A1
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- EP
- European Patent Office
- Prior art keywords
- clamping rollers
- pair
- forming
- clamping
- folding edge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims description 11
- 239000002184 metal Substances 0.000 claims abstract description 36
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims description 41
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
- B21D5/083—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers for obtaining profiles with changing cross-sectional configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
- B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/004—Bending sheet metal along straight lines, e.g. to form simple curves with program control
Definitions
- the present invention relates to a roll-forming machine according to the preamble of claim 1 and a method according to the preamble of claim 8.
- the roll-forming machine of the present invention is to be used for roll-forming a flat sheet metal strip into a hat beam which has a profile that varies along its length and which has a central flange, first and second side flanges on opposite sides of the central flange, a first web extending between the central flange and the first side flange and a second web extending between the central flange and the second side flange.
- a roll-forming machine for roll-forming a flat sheet metal strip into such a hat beam is previously known from WO 2007/008152 A1 .
- the object of the present invention is to achieve a further development of a roll-forming machine of the above-mentioned type so as to provide a roll-forming machine that is improved in at least some aspect.
- the roll-forming machine of the present invention comprises several forming stations for successively roll-forming a flat sheet metal strip into a hat beam of the above-mentioned type, wherein each forming station comprises a first pair of clamping rollers for clamping one of the side flanges and a second pair of clamping rollers for clamping the central flange, the first and second pairs of clamping rollers being configured to fold one of the webs in relation to the associated side flange over a first peripheral folding edge on a clamping roller included in the first pair of clamping rollers and in relation to the central flange over a second peripheral folding edge on a clamping roller included in the second pair of clamping rollers.
- the clamping rollers of the second pair of clamping rollers are configured to be individually displaceable during a forming operation upwards and downwards in vertical direction and horizontally forwards and backwards as seen in the intended feeding direction of the sheet metal strip through the forming stations, wherein the displacement of the clamping rollers of the second pair of clamping rollers during a forming operation is controlled by means of an electronic control device in such a manner that a plane that goes through the centre axes of both clamping rollers of the second pair of clamping rollers is always maintained perpendicular to the part of the central flange received in the nip between these clamping rollers.
- the roll-forming machine of the invention is particularly designed to be used for forming hat beams where each side flange is flat and extends straightly and where the vertical distance between the central flange and the side flanges varies along the length of the hat beam so that the central flange has a curvature or inclination as seen in a longitudinal section through the central flange.
- Such hat beams may for instance have a design of the type illustrated in Figs 1a-1c , where a part of the central flange bulges inwards, or a design of the type illustrated in Figs 2a-2c , where a part of the central flange bulges outwards.
- a roll-forming machine of the present invention can be used for roll-forming a hat beam where the width of the central flange is relatively small, as will be explained in closer detail in the description following below.
- the invention also relates to a method having the features defined in claim 8.
- the roll-forming machine of the present invention is particularly intended to be used for roll-forming a flat sheet metal strip into a hat beam 1, 1' which has a U-shaped cross-sectional shape that varies along the length of the hat beam, wherein the hat beam 1, 1' has a central flange 2, first and second side flanges 3a, 3b on opposite sides of the central flange 2, a first web 4a extending between the central flange 2 and the first side flange 3a and a second web 4b extending between the central flange 2 and the second side flange 3b.
- the side flanges 3a, 3b of the illustrated hat beams 1, 1' are flat and straight and located in plane with each other, wherein the vertical distance between the central flange 2 and the side flanges 3a, 3b varies along the length of the hat beam such that the central flange 2 has a curvature as seen in a longitudinal section through the central flange.
- the width of the central flange 2 is constant throughout the length of the hat beam 1, 1'.
- the roll-forming machine of the present invention may of course also be configured to form hat beams with other designs than here illustrated.
- the forming stations of the roll-forming machine may as an alternative be configured to form a hat beam with side flanges 3a, 3b which are slightly V-shaped as seen in a cross-section through the hat beam or which have another nonplanar design.
- the roll-forming machine of the invention may also be configured to form a hat beam with a central flange 2 which has a width that varies along the length of the hat beam.
- the distance between the central flange 2 and the side flanges 3a, 3b may vary along the length of the hat beam in any other desired manner than here illustrated, and it is of course also possible that this distance is not the same at one end of the hat beam as at the other end thereof.
- the hat beam 1 illustrated in Figs 1a-1c has a section 6 at the middle of the hat beam, as seen in the longitudinal direction thereof, where the central flange 2 bulges inwards, i.e. where the hat beam has a reduced height as compared to the height at the end sections 7, 8 of the hat beam.
- This hat beam 1 is formed from a plane sheet metal strip 5 which before the roll-forming thereof has been cut to the shape illustrated in Fig 3 , either by means of edge cutters (not shown) included in the roll-forming machine or by means of edge cutters included in a separate cutting unit.
- the sheet metal strip is subjected to a number of consecutive forming steps in a number of forming stations of the roll-forming machine, wherein the forming stations fold the sheet metal strip 5 along the fold lines F1-F4 illustrated by broken lines in Fig 3 .
- Each web 4a, 4b is folded in relation to the central flange 2 and the associated side flange 3a, 3b in several forming steps S1-S11 effected by different forming stations, where the angle of each folded corner C1-C4 on the sheet metal strip 5 is changed to equal degrees in each forming step, as illustrated in Figs 5 and 6.
- Fig 5 illustrates the different forming steps at an end section 7, 8 of the hat beam 1 where it has its maximum height
- Fig 6 illustrates the different forming steps at the middle of the hat beam 1 where it has its minimum height.
- each side flange 3a, 3b is maintained at a constant height in one and the same horizontal plane, whereas the vertical position of the central flange 2 is varied, as the sheet metal strip 5 is moved in its longitudinal direction through the different forming stations of the roll-forming machine.
- the central flange 2 is shown at a constant vertical position and the side flanges 3a, 3b are shown at different vertical positions in the different forming steps S1-S11 illustrated in Figs 5 and 6 .
- the hat beam 1' illustrated in Figs 2a-2c has a section 6' at the middle of the hat beam, as seen in the longitudinal direction thereof, where the central flange 2 bulges outwards, i.e. where the hat beam has an increased height as compared to the height at the end sections 7', 8' of the hat beam.
- This hat beam 1' is formed from a plane sheet metal strip 5', which before the roll-forming thereof has been cut to the shape illustrated in Fig 4 .
- the sheet metal strip is subjected to a number of consecutive forming steps in a number of forming stations of the roll-forming machine, wherein the forming stations fold the sheet metal strip 5' along the fold lines F1-F4 illustrated by broken lines in Fig 4 .
- Each web 4a, 4b is folded in relation to the central flange 2 and the associated side flange 3a, 3b in several forming steps S1-S11 in the manner described above.
- the sheet metal strip 5, 5' is to be fed in its longitudinal direction through the consecutively arranged forming stations 20a, 20b of the roll-forming machine.
- the intended feeding direction of the sheet metal strip 5, 5' through the forming stations is in the following referred to as the feeding direction.
- forming stations 20a included in a roll-forming machine are illustrated in Figs 7 and 11 .
- the forming stations 20a have the same design and are configured to form one side of the hat beam 1, the left side as seen in Figs 7 and 11 .
- the other side of the hat beam 1, the right side as seen in Figs 7 and 11 is formed by forming stations 20b (see Fig 12 ) which have the same design as the forming stations illustrated in Figs 7 and 11 but are inverted about a vertical axis as compared to the forming stations illustrated in Figs 7 and 11 .
- the forming stations are divided into a number of first forming stations 20a configured to form a first side of the hat beam 1 and a corresponding number of second forming stations 20b configured to form an opposite second side of the hat beam 1, wherein the clamping rollers of each first forming station 20a are configured to fold only the first web 4a in relation to the first side flange 3a and in relation to the central flange 2 and wherein the clamping rollers of each second forming station 20b are configured to fold only the second web 4b in relation to the second side flange 3b and in relation to the central flange 2.
- the first and second forming stations 20a, 20b are alternately arranged as seen in the feeding direction, as illustrated in Fig 12 , wherein each first forming station 20a is followed by one of the second forming stations 20b and vice versa.
- the first and second forming stations 20a, 20b are arranged in zigzag along the feeding direction.
- the roll-forming machine has a stand 10 (very schematically illustrated in Figs 7 and 11 ), which is to be arranged in a fixed position on a support surface at a production site.
- Each forming station 20a, 20b comprises a frame 21 which is fixed to and carried by the stand 10 and which in its turn supports the clamping rollers 22a, 22b, 23a, 23b of the forming station.
- Each forming station 20a, 20b comprises a first pair of clamping rollers 22a, 22b configured to clamp one of the side flanges 3a, 3b and a second pair of clamping rollers 23a, 23b configured to clamp the central flange 2.
- first pair of clamping rollers 22a, 22b configured to clamp one of the side flanges 3a, 3b
- second pair of clamping rollers 23a, 23b configured to clamp the central flange 2.
- the first pair of clamping rollers comprises an upper clamping roller 22a, which is configured to be in contact with the associated side flange 3a from above, and an opposite lower clamping roller 22b, which is configured to be in contact with the associated side flange 3a from below.
- the second pair of clamping rollers comprises an upper clamping roller 23a, which is configured to be in contact with the central flange 2 from above, and an opposite lower clamping roller 23b, which is configured to be in contact with the central flange 2 from below.
- the first and second pairs of clamping rollers 22a, 22b, 23a, 23b are configured to hold one of the webs 4a, 4b freely stretched between the first pair of clamping rollers 22a, 22b and the second pair of clamping rollers 23a, 23b and to fold this web 4a, 4b in relation to the associated side flange 3a, 3b over a first peripheral folding edge 24 on the lower clamping roller 22b of the first pair of clamping rollers and in relation to the central flange 2 over a second peripheral folding edge 25 on the upper clamping roller 23a of the second pair of clamping rollers.
- the first peripheral folding edge 24 is to follow the fold line F1 and the corresponding corner C1 between the first side flange 3a and the first web 4a and the second peripheral folding edge 25 is to follow the fold line F2 and the corresponding corner C2 between the first web 4a and the central flange 2
- the first peripheral folding edge 24 is to follow the fold line F4 and the corresponding corner C4 between the second side flange 3b and the second web 4b
- the second peripheral folding edge 25 is to follow the fold line F3 and the corresponding corner C3 between the second web 4b and the central flange 2.
- Each clamping roller 22a, 22b, 23a, 23b has a horizontal centre axis CA1-CA4 and is rotatable about an axis of rotation that coincides with the centre axis of the clamping roller. At least one of the clamping rollers in each pair of clamping rollers, and preferably both clamping rollers in each pair, is driven in rotation by means of its drive motor (not shown), preferably in the form of an electric drive motor.
- the clamping rollers 22a, 22b of the first pair of clamping rollers are mounted to a common support 26, which is configured to be horizontally displaceable sideways transversally to the feeding direction along a transverse horizontal guide rail 27.
- the support 26 is supported by the guide rail 27 via a connecting member 28, which is slidably mounted to the guide rail 27.
- the guide rail 27 is in its turn fixedly connected to the frame 21.
- the support 26 is pivotable about a vertical pivot axis PA1, which preferably intersects the first peripheral folding edge 24.
- the support 26 is rotatably mounted to the connecting member 28 and configured to be pivoted about the vertical pivot axis PA1 by rotation of the support 26 in relation to the connecting member 28.
- the clamping rollers 22a, 22b of the first pair of clamping rollers are moveable together by movement of the support 26 in relation to the guide rail 27 and in relation to the connecting member 28.
- the roll-forming machine comprises an electronic control device 12 (very schematically illustrated in Fig 7 ), which is configured to control the sideways displacement and the pivoting of the above-mentioned support 26 during a forming operation in such a manner that the first peripheral folding edge 24 follows the fold line F1 and the corresponding corner C1 between the freely stretched web 4a and the associated side flange 3a and in such a manner that a vertical plane P1 (see Fig 9 ) that goes through the centre axes CA1, CA2 of both clamping rollers 22a, 22b of the first pair of clamping rollers is always maintained perpendicular to the part of this fold line F1 that is in contact with the first peripheral folding edge 24, i.e. perpendicular to the part of the corner C1 between the freely stretched web 4a and the associated side flange 3a that is in contact with the first peripheral folding edge 24.
- an electronic control device 12 (very schematically illustrated in Fig 7 ), which is configured to control the sideways displacement and the pivoting of the above-mentione
- the above-mentioned support 26 could also be configured to be horizontally displaceable forwards and backwards in the feeding direction along a horizontal guide rail in order to allow the position of the support 26 in the feeding direction to be adjustable under the control of the electronic control device 12 during a forming operation and thereby allow the support 26 to be moved in such a manner that the first pair of clamping rollers 22a, 22b can be turned about a vertical axis that intersects the point of contact PC1 between the first peripheral folding edge 24 and the sheet metal strip 5.
- such an adjustability of the support 26 has not been illustrated in Figs 7 and 11 and is not necessary if the support 26 is pivotable about a pivot axis PA1 that intersects said point of contact PC1.
- the clamping rollers 23a, 23b of the second pair of clamping rollers are configured to be individually displaceable during a forming operation upwards and downwards in vertical direction and horizontally forwards and backwards in the feeding direction.
- each clamping rollers 23a, 23b of the second pair of clamping rollers is carried by a holder 28a, 28b, which in its turn is supported by and vertically moveable in relation to a support 29a, 29b.
- Each support 29a, 29b is configured to be horizontally displaceable forwards and backwards in the feeding direction along a horizontal guide rail 30a, 30b, which is fixed to the frame 21.
- the electronic control device 12 is configured to control the displacement of these clamping rollers 23a, 23b during a forming operation in such a manner that a plane P2 (see Figs 10a-10c ) that goes through the centre axes CA3, CA4 of both clamping rollers 23a, 23b of the second pair of clamping rollers is always maintained perpendicular to the part of the central flange 2 received in the nip 31 between these clamping rollers 23a, 23b.
- the electronic control device 12 is preferably also configured to control the individual movements of the clamping rollers 23a, 23b of the second pair of clamping rollers during a forming operation and/or the movements of the first pair of clamping rollers 22a, 22b in the feeding direction during a forming operation in such a manner that the point of contact PC2 between the second peripheral folding edge 25 and the sheet metal strip 5 is always maintained in the same cross-sectional plane through the sheet metal strip 5 as the point of contact PC1 between the first peripheral folding edge 24 and the sheet metal strip 5, as illustrated in Figs 10a-10c .
- the clamping rollers 23a, 23b of the second pair of clamping rollers should also be configured to be individually and horizontally displaceable sideways transversally to the feeding direction and individually pivotable about a vertical pivot axis PA2, PA3 during a forming operation.
- the electronic control device 12 is configured to control the sideways displacement and the pivoting of these clamping rollers 23a, 23b during a forming operation in such a manner that the second peripheral folding edge 25 follows the fold line F2, F3 and the corresponding corner C2, C3 between the freely stretched web 4a, 4b and the central flange 2 and in such a manner that the above-mentioned plane P2 that goes through the centre axes CA3, CA4 of both clamping rollers 23a, 23b of the second pair of clamping rollers is always maintained perpendicular to the part of this fold line F2, F3 that is in contact with the second peripheral folding edge 25, i.e. perpendicular to the part of the corner C2, C3 between the freely stretched web 4a, 4b and the central flange 2 that is in contact with the second peripheral folding edge 25.
- each one of the above-mentioned supports 29a, 29b of the clamping rollers 23a, 23b of the second pair of clamping rollers is configured to be horizontally displaceable sideways transversally to the feeding direction along a transverse horizontal guide rail 32a, 32b, which is supported by the above-mentioned guide rail 30a, 30b via a first connecting member 33a, 33b that is slidably mounted to the last-mentioned guide rail 30a, 30b.
- the support 29a, 29b is supported by the transverse horizontal guide rail 32a, 32b via a second connecting member 34a, 34b, which is slidably mounted to this guide rail 32a, 32b.
- the support 29a, 29b is pivotable about a vertical pivot axis PA2, PA3, wherein the vertical pivot axis PA2 of the support 29a associated with the upper clamping roller 23a preferably intersects the second peripheral folding edge 25.
- the support 29a, 29b is rotatably mounted to the second connecting member 34a, 34b and configured to be pivoted about the vertical pivot axis PA2, PA3 by rotation of the support 29a, 29b in relation to the second connecting member 34a, 34b.
- Power devices for effecting the different movements of the clamping rollers 22a, 22b, 23a, 23b described above have been omitted in the drawings for the sake of clarity and in order to facilitate the illustration of other parts of the forming stations. These power devices are with advantage electric motors in order to enable a control of the movements of the clamping rollers 22a, 22b, 23a, 23b with high accuracy, but it would also be possible to use other types of power devices, such as for instance pneumatically or hydraulically controlled power devices.
- the operation of the power devices is controlled by the electronic control device 12 in accordance with pre-programmed algorithms.
- the electronic control device 12 may be implemented by one single electronic control unit or by two or more mutually cooperating electronic control units.
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Abstract
Description
- The present invention relates to a roll-forming machine according to the preamble of
claim 1 and a method according to the preamble ofclaim 8. - The roll-forming machine of the present invention is to be used for roll-forming a flat sheet metal strip into a hat beam which has a profile that varies along its length and which has a central flange, first and second side flanges on opposite sides of the central flange, a first web extending between the central flange and the first side flange and a second web extending between the central flange and the second side flange. A roll-forming machine for roll-forming a flat sheet metal strip into such a hat beam is previously known from
WO 2007/008152 A1 . - The object of the present invention is to achieve a further development of a roll-forming machine of the above-mentioned type so as to provide a roll-forming machine that is improved in at least some aspect.
- According to the present invention, the above-mentioned object is achieved by means of a roll-forming machine having the features defined in
claim 1. - The roll-forming machine of the present invention comprises several forming stations for successively roll-forming a flat sheet metal strip into a hat beam of the above-mentioned type, wherein each forming station comprises a first pair of clamping rollers for clamping one of the side flanges and a second pair of clamping rollers for clamping the central flange, the first and second pairs of clamping rollers being configured to fold one of the webs in relation to the associated side flange over a first peripheral folding edge on a clamping roller included in the first pair of clamping rollers and in relation to the central flange over a second peripheral folding edge on a clamping roller included in the second pair of clamping rollers. According to the invention, the clamping rollers of the second pair of clamping rollers are configured to be individually displaceable during a forming operation upwards and downwards in vertical direction and horizontally forwards and backwards as seen in the intended feeding direction of the sheet metal strip through the forming stations, wherein the displacement of the clamping rollers of the second pair of clamping rollers during a forming operation is controlled by means of an electronic control device in such a manner that a plane that goes through the centre axes of both clamping rollers of the second pair of clamping rollers is always maintained perpendicular to the part of the central flange received in the nip between these clamping rollers.
- The roll-forming machine of the invention is particularly designed to be used for forming hat beams where each side flange is flat and extends straightly and where the vertical distance between the central flange and the side flanges varies along the length of the hat beam so that the central flange has a curvature or inclination as seen in a longitudinal section through the central flange. Such hat beams may for instance have a design of the type illustrated in
Figs 1a-1c , where a part of the central flange bulges inwards, or a design of the type illustrated inFigs 2a-2c , where a part of the central flange bulges outwards. The above-mentioned displaceability of the clamping rollers of the second pair of clamping rollers during a forming operation upwards and downwards in vertical direction and horizontally forwards and backwards as seen in the feeding direction implies that it will be possible to adapt the positions of these clamping rollers in dependence on the curvature or inclination of the central flange in such a manner that the plane that goes through the centre axes of both of these clamping rollers is always maintained perpendicular to the part of the central flange received in the nip between these clamping rollers. Hereby, no undesired bending stresses will be induced in the central flange when a vertically curved or inclined part of the central flange is passing between the two clamping rollers in question. - Furthermore, by keeping the central flange clamped between two clamping rollers, a roll-forming machine of the present invention can be used for roll-forming a hat beam where the width of the central flange is relatively small, as will be explained in closer detail in the description following below.
- Further advantageous features of the roll-forming machine according to the present invention will appear from the description following below and the dependent claims.
- The invention also relates to a method having the features defined in
claim 8. - Further advantageous features of the method according to the present invention will appear from the description following below and the dependent claims.
- The invention will in the following be more closely described by means of embodiment examples, with reference to the appended drawings. In the drawings:
- Fig 1a
- is a perspective view of a hat beam according to a first variant,
- Fig 1b
- is a front view of the hat beam of
Fig 1a , - Fig 1c
- is a lateral view of the hat beam of
Fig 1a , - Fig 2a
- is a perspective view of a hat beam according to another variant,
- Fig 2b
- is a front view of the hat beam of
Fig 2a , - Fig 2c
- is a lateral view of the hat beam of
Fig 2a , - Fig 3
- is a planar view of a flat sheet metal strip with illustrated fold lines to be used for producing the hat beam of
Figs 1a-1c , - Fig 4
- is a planar view of a flat sheet metal strip with illustrated fold lines to be used for producing the hat beam of
Figs 2a-2c , - Fig 5
- illustrates consecutive steps for roll-forming the hat beam of
Figs 1a-1c , as seen in a cross-section at an end of the hat beam where it has its maximum height, - Fig 6
- illustrates consecutive steps for roll-forming the hat beam of
Figs 1a-1c , as seen in a cross-section at the middle of the hat beam where it has its minimum height. - Fig 7
- is a schematic illustration of one of the forming stations included in a roll-forming machine according to the present invention,
- Fig 8
- is a schematic perspective view of the forming station of
Fig 7 , - Fig 9
- is a schematic planar view from above of the forming station of
Fig 7 , - Figs 10a-10c
- are schematic lateral views of the forming station of
Fig 7 , as seen with the clamping rollers of the second pair of clamping rollers in different mutual positions, - Fig 11
- is a schematic illustration of the final forming station of a roll-forming machine according to the invention, and
- Fig 12
- is a schematic perspective view of a number of consecutive forming stations of a roll-forming machine according to the invention.
- The roll-forming machine of the present invention is particularly intended to be used for roll-forming a flat sheet metal strip into a
hat beam 1, 1' which has a U-shaped cross-sectional shape that varies along the length of the hat beam, wherein thehat beam 1, 1' has acentral flange 2, first andsecond side flanges central flange 2, afirst web 4a extending between thecentral flange 2 and thefirst side flange 3a and asecond web 4b extending between thecentral flange 2 and thesecond side flange 3b. - The
side flanges hat beams 1, 1' are flat and straight and located in plane with each other, wherein the vertical distance between thecentral flange 2 and theside flanges central flange 2 has a curvature as seen in a longitudinal section through the central flange. In the illustrated examples, the width of thecentral flange 2 is constant throughout the length of thehat beam 1, 1'. However, the roll-forming machine of the present invention may of course also be configured to form hat beams with other designs than here illustrated. For example, the forming stations of the roll-forming machine may as an alternative be configured to form a hat beam withside flanges central flange 2 which has a width that varies along the length of the hat beam. Furthermore, the distance between thecentral flange 2 and theside flanges - The
hat beam 1 illustrated inFigs 1a-1c has asection 6 at the middle of the hat beam, as seen in the longitudinal direction thereof, where thecentral flange 2 bulges inwards, i.e. where the hat beam has a reduced height as compared to the height at theend sections hat beam 1 is formed from a planesheet metal strip 5 which before the roll-forming thereof has been cut to the shape illustrated inFig 3 , either by means of edge cutters (not shown) included in the roll-forming machine or by means of edge cutters included in a separate cutting unit. In order to transform this planesheet metal strip 5 into thehat beam 1 illustrated inFigs 1a-1c , the sheet metal strip is subjected to a number of consecutive forming steps in a number of forming stations of the roll-forming machine, wherein the forming stations fold thesheet metal strip 5 along the fold lines F1-F4 illustrated by broken lines inFig 3 . Eachweb central flange 2 and the associatedside flange sheet metal strip 5 is changed to equal degrees in each forming step, as illustrated inFigs 5 and 6. Fig 5 illustrates the different forming steps at anend section hat beam 1 where it has its maximum height, andFig 6 illustrates the different forming steps at the middle of thehat beam 1 where it has its minimum height. In the roll-forming machine described below, eachside flange central flange 2 is varied, as thesheet metal strip 5 is moved in its longitudinal direction through the different forming stations of the roll-forming machine. However, for the sake of clarity, thecentral flange 2 is shown at a constant vertical position and theside flanges Figs 5 and 6 . - The hat beam 1' illustrated in
Figs 2a-2c has a section 6' at the middle of the hat beam, as seen in the longitudinal direction thereof, where thecentral flange 2 bulges outwards, i.e. where the hat beam has an increased height as compared to the height at the end sections 7', 8' of the hat beam. This hat beam 1' is formed from a plane sheet metal strip 5', which before the roll-forming thereof has been cut to the shape illustrated inFig 4 . In order to transform this plane sheet metal strip 5' into the hat beam 1' illustrated inFigs 2a-2c , the sheet metal strip is subjected to a number of consecutive forming steps in a number of forming stations of the roll-forming machine, wherein the forming stations fold the sheet metal strip 5' along the fold lines F1-F4 illustrated by broken lines inFig 4 . Eachweb central flange 2 and the associatedside flange - The
sheet metal strip 5, 5' is to be fed in its longitudinal direction through the consecutively arranged formingstations sheet metal strip 5, 5' through the forming stations is in the following referred to as the feeding direction. - Two forming
stations 20a included in a roll-forming machine according to an embodiment of the present invention are illustrated inFigs 7 and11 . The formingstations 20a have the same design and are configured to form one side of thehat beam 1, the left side as seen inFigs 7 and11 . The other side of thehat beam 1, the right side as seen inFigs 7 and11 , is formed by formingstations 20b (seeFig 12 ) which have the same design as the forming stations illustrated inFigs 7 and11 but are inverted about a vertical axis as compared to the forming stations illustrated inFigs 7 and11 . Thus, in this case, the forming stations are divided into a number of first formingstations 20a configured to form a first side of thehat beam 1 and a corresponding number of second formingstations 20b configured to form an opposite second side of thehat beam 1, wherein the clamping rollers of each first formingstation 20a are configured to fold only thefirst web 4a in relation to thefirst side flange 3a and in relation to thecentral flange 2 and wherein the clamping rollers of each second formingstation 20b are configured to fold only thesecond web 4b in relation to thesecond side flange 3b and in relation to thecentral flange 2. The first and second formingstations Fig 12 , wherein each first formingstation 20a is followed by one of the second formingstations 20b and vice versa. Thus, the first and second formingstations stations hat beams 1, 1' where the width of thecentral flange 2 is relatively small. - The roll-forming machine has a stand 10 (very schematically illustrated in
Figs 7 and11 ), which is to be arranged in a fixed position on a support surface at a production site. Each formingstation frame 21 which is fixed to and carried by thestand 10 and which in its turn supports the clampingrollers - Each forming
station rollers side flanges rollers central flange 2. Thus, oneside flange clamping rollers central flange 2 is clamped between the twoclamping rollers upper clamping roller 22a, which is configured to be in contact with the associatedside flange 3a from above, and an oppositelower clamping roller 22b, which is configured to be in contact with the associatedside flange 3a from below. The second pair of clamping rollers comprises anupper clamping roller 23a, which is configured to be in contact with thecentral flange 2 from above, and an oppositelower clamping roller 23b, which is configured to be in contact with thecentral flange 2 from below. - The first and second pairs of clamping
rollers webs rollers rollers web side flange peripheral folding edge 24 on thelower clamping roller 22b of the first pair of clamping rollers and in relation to thecentral flange 2 over a second peripheral foldingedge 25 on theupper clamping roller 23a of the second pair of clamping rollers. Thus, in each first formingstation 20a, the firstperipheral folding edge 24 is to follow the fold line F1 and the corresponding corner C1 between thefirst side flange 3a and thefirst web 4a and the second peripheral foldingedge 25 is to follow the fold line F2 and the corresponding corner C2 between thefirst web 4a and thecentral flange 2, whereas in each second formingstation 20b, the firstperipheral folding edge 24 is to follow the fold line F4 and the corresponding corner C4 between thesecond side flange 3b and thesecond web 4b and the second peripheral foldingedge 25 is to follow the fold line F3 and the corresponding corner C3 between thesecond web 4b and thecentral flange 2. - Each clamping
roller - The clamping
rollers common support 26, which is configured to be horizontally displaceable sideways transversally to the feeding direction along a transversehorizontal guide rail 27. In the illustrated example, thesupport 26 is supported by theguide rail 27 via a connectingmember 28, which is slidably mounted to theguide rail 27. Theguide rail 27 is in its turn fixedly connected to theframe 21. Furthermore, thesupport 26 is pivotable about a vertical pivot axis PA1, which preferably intersects the firstperipheral folding edge 24. In the illustrated example, thesupport 26 is rotatably mounted to the connectingmember 28 and configured to be pivoted about the vertical pivot axis PA1 by rotation of thesupport 26 in relation to the connectingmember 28. Thus, the clampingrollers support 26 in relation to theguide rail 27 and in relation to the connectingmember 28. - The roll-forming machine comprises an electronic control device 12 (very schematically illustrated in
Fig 7 ), which is configured to control the sideways displacement and the pivoting of the above-mentionedsupport 26 during a forming operation in such a manner that the firstperipheral folding edge 24 follows the fold line F1 and the corresponding corner C1 between the freely stretchedweb 4a and the associatedside flange 3a and in such a manner that a vertical plane P1 (seeFig 9 ) that goes through the centre axes CA1, CA2 of both clampingrollers peripheral folding edge 24, i.e. perpendicular to the part of the corner C1 between the freely stretchedweb 4a and the associatedside flange 3a that is in contact with the firstperipheral folding edge 24. - The above-mentioned
support 26 could also be configured to be horizontally displaceable forwards and backwards in the feeding direction along a horizontal guide rail in order to allow the position of thesupport 26 in the feeding direction to be adjustable under the control of theelectronic control device 12 during a forming operation and thereby allow thesupport 26 to be moved in such a manner that the first pair of clampingrollers peripheral folding edge 24 and thesheet metal strip 5. However, such an adjustability of thesupport 26 has not been illustrated inFigs 7 and11 and is not necessary if thesupport 26 is pivotable about a pivot axis PA1 that intersects said point of contact PC1. - The clamping
rollers rollers holder support support horizontal guide rail frame 21. Theelectronic control device 12 is configured to control the displacement of these clampingrollers Figs 10a-10c ) that goes through the centre axes CA3, CA4 of both clampingrollers central flange 2 received in thenip 31 between these clampingrollers - The
electronic control device 12 is preferably also configured to control the individual movements of the clampingrollers rollers edge 25 and thesheet metal strip 5 is always maintained in the same cross-sectional plane through thesheet metal strip 5 as the point of contact PC1 between the firstperipheral folding edge 24 and thesheet metal strip 5, as illustrated inFigs 10a-10c . - When the width of the
central flange 2 is constant throughout the length of thehat beam 1, 1', the fold lines F2, F3 between thecentral flange 2 and thewebs Figs 3 and 4 . However, if the width of thecentral flange 2 varies along the length of thehat beam 1, these fold lines F2, F3 will be curved or inclined along the parts of thesheet metal plate 5 where the width of thecentral flange 2 varies. - If the roll-forming machine is to be used for forming a hat beam with a
central flange 2 which has a width that varies along the length of the hat beam, the clampingrollers electronic control device 12 is configured to control the sideways displacement and the pivoting of these clampingrollers edge 25 follows the fold line F2, F3 and the corresponding corner C2, C3 between the freely stretchedweb central flange 2 and in such a manner that the above-mentioned plane P2 that goes through the centre axes CA3, CA4 of both clampingrollers edge 25, i.e. perpendicular to the part of the corner C2, C3 between the freely stretchedweb central flange 2 that is in contact with the second peripheral foldingedge 25. - In the example illustrated in
Figs 7 and11 , each one of the above-mentionedsupports rollers horizontal guide rail guide rail member guide rail support horizontal guide rail member guide rail support support 29a associated with theupper clamping roller 23a preferably intersects the second peripheral foldingedge 25. In the illustrated example, thesupport member support member - Power devices for effecting the different movements of the clamping
rollers rollers electronic control device 12 in accordance with pre-programmed algorithms. - The
electronic control device 12 may be implemented by one single electronic control unit or by two or more mutually cooperating electronic control units. - The invention is of course not in any way limited to the embodiments described above. On the contrary, several possibilities to modifications thereof should be apparent to a person skilled in the art without thereby deviating from the basic idea of the invention as defined in the appended claims.
Claims (14)
- A roll-forming machine with a number of forming stations (20a, 20b) for successively roll-forming a flat sheet metal strip (5, 5') into a hat beam (1, 1') which has a profile that varies along its length and which has a central flange (2), first and second side flanges (3a, 3b) on opposite sides of the central flange (2), a first web (4a) extending between the central flange (2) and the first side flange (3a) and a second web (4b) extending between the central flange (2) and the second side flange (3b),
wherein each forming station (20a, 20b) comprises a first pair of clamping rollers (22a, 22b) for clamping one of the side flanges (3a, 3b) and a second pair of clamping rollers (23a, 23b) for clamping the central flange (2), the first and second pairs of clamping rollers (22a, 22b, 23a, 23b) being configured to fold one of the webs (4a, 4b) in relation to the associated side flange (3a, 3b) over a first peripheral folding edge (24) on a clamping roller (22b) included in the first pair of clamping rollers and in relation to the central flange (2) over a second peripheral folding edge (25) on a clamping roller (23a) included in the second pair of clamping rollers,
characterized in:- that the clamping rollers (23a, 23b) of the second pair of clamping rollers are configured to be individually displaceable during a forming operation upwards and downwards in vertical direction and horizontally forwards and backwards as seen in the intended feeding direction of the sheet metal strip (5, 5') through the forming stations (20a, 20b); and- that the roll-forming machine comprises an electronic control device (12) which is configured to control the displacement of the clamping rollers (23a, 23b) of the second pair of clamping rollers during a forming operation in such a manner that a plane (P2) that goes through the centre axes (CA3, CA4) of both clamping rollers (23a, 23b) of the second pair of clamping rollers is always maintained perpendicular to the part of the central flange (2) received in the nip (31) between these clamping rollers (23a, 23b). - A roll-forming machine according to claim 1, characterized in that the clamping rollers (22a, 22b) of said first pair of clamping rollers are mounted to a support (26) which is configured to be displaceable sideways transversally to said feeding direction and pivotable about a vertical pivot axis (PA1) during a forming operation, wherein the electronic control device (12) is configured to control the sideways displacement and the pivoting of this support (26) during a forming operation in such a manner that said first peripheral folding edge (24) is made to follow a fold line (F1, F4) between said web (4a, 4b) and the associated side flange (3a, 3b) and in such a manner that a plane (P1) that goes through the centre axes (CA1, CA2) of both clamping rollers (22a, 22b) of the first pair of clamping rollers is always maintained perpendicular to the part of this fold line (F1, F4) that is in contact with the first peripheral folding edge (24).
- A roll-forming machine according to claim 2, characterized in that said vertical pivot axis (PA1) intersects the first peripheral folding edge (24).
- A roll-forming machine according to any of claims 1-3, characterized in:- that the clamping rollers (23a, 23b) of the second pair of clamping rollers are configured to be individually displaceable sideways transversally to said feeding direction and individually pivotable about a vertical pivot axis (PA2, PA3) during a forming operation; and- that the electronic control device (12) is configured to control the sideways displacement and the pivoting of the clamping rollers (23a, 23b) of the second pair of clamping rollers during a forming operation in such a manner that said second peripheral folding edge (25) is made to follow a fold line (F2, F3) between said web (4a, 4b) and the central flange (2) and in such a manner that the plane (P2) that goes through the centre axes (CA3, CA4) of both clamping rollers (23a, 23b) of the second pair of clamping rollers is always maintained perpendicular to the part of this fold line (F2, F3) that is in contact with the second peripheral folding edge (25).
- A roll-forming machine according to claim 4, characterized in that the vertical pivot axis (PA2) of the clamping roller (23a) provided with the second peripheral folding edge (25) intersects the second peripheral folding edge (25).
- A roll-forming machine according to any of claims 1-5, characterized in:- that the forming stations comprise a number of first forming stations (20a) and a corresponding number of second forming stations (20b), wherein the clamping rollers (22a, 22b, 23a, 23b) of each first forming station (20a) are configured to fold only the first web (4a) in relation to the first side flange (3a) and in relation to the central flange (2) and wherein the clamping rollers (22a, 22b, 23a, 23b) of each second forming station (20b) are configured to fold only the second web (4b) in relation to the second side flange (3b) and in relation to the central flange (2); and- that the first and second forming stations (20a, 20b) are alternately arranged as seen in said feeding direction.
- A roll-forming machine according to any of claims 1-6, characterized in that the electronic control device (12) is configured to control the individual movements of the clamping rollers (23a, 23b) of the second pair of clamping rollers and/or the movements of the first pair of clamping rollers (22a, 22b) during a forming operation in such a manner that the point of contact (PC2) between the second peripheral folding edge (25) and the sheet metal strip (5) is always maintained in the same cross-sectional plane through the sheet metal strip (5) as the point of contact (PC1) between the first peripheral folding edge (24) and the sheet metal strip (5).
- A method for successively roll-forming, in a number of forming stations (20a, 20b), a flat sheet metal strip (5, 5') into a hat beam (1, 1') which has a profile that varies along its length and which has a central flange (2), first and second side flanges (3a, 3b) on opposite sides of the central flange (2), a first web (4a) extending between the central flange (2) and the first side flange (3a) and a second web (4b) extending between the central flange (2) and the second side flange (3b),
wherein, in each forming station (20a, 20b), one of the side flanges (3a, 3b) is clamped between two clamping rollers (22a, 22b) of a first pair of clamping rollers and the central flange (2) is clamped between two clamping rollers (23a, 23b) of a second pair of clamping rollers, the first and second pairs of clamping rollers (22a, 22b, 23a, 23b) folding one of the webs (4a, 4b) in relation to the associated side flange (3a, 3b) over a first peripheral folding edge (24) on a clamping roller (22b) included in the first pair of clamping rollers and in relation to the central flange (2) over a second peripheral folding edge (25) on a clamping roller (23a) included in the second pair of clamping rollers,
characterized in that the clamping rollers (23a, 23b) of the second pair of clamping rollers are individually displaceable during a forming operation upwards and downwards in vertical direction and horizontally forwards and backwards as seen in the intended feeding direction of the sheet metal strip (5, 5') through the forming stations (20a, 20b), the displacement of the clamping rollers (23a, 23b) of the second pair of clamping rollers during a forming operation being controlled by an electronic control device (12) in such a manner that a plane (P2) that goes through the centre axes (CA3, CA4) of both clamping rollers (23a, 23b) of the second pair of clamping rollers is always maintained perpendicular to the part of the central flange (2) received in the nip (31) between these clamping rollers (23a, 23b). - A method according to claim 8, characterized in that the clamping rollers (22a, 22b) of said first pair of clamping rollers are mounted to a support (26) which is configured to be displaceable sideways transversally to said feeding direction and pivotable about a vertical pivot axis (PA1) during a forming operation, wherein the electronic control device (12) controls the sideways displacement and the pivoting of this support (26) during a forming operation in such a manner that said first peripheral folding edge (24) is made to follow a fold line (F1, F4) between said web (4a, 4b) and the associated side flange (3a, 3b) and in such a manner that a plane (P1) that goes through the centre axes (CA1, CA2) of both clamping rollers (22a, 22b) of the first pair of clamping rollers is always maintained perpendicular to the part of this fold line (F1, F4) that is in contact with the first peripheral folding edge (24).
- A method according to claim 9, characterized in that said vertical pivot axis (PA1) intersects the first peripheral folding edge (24).
- A method according to any of claims 8-10, characterized in that the clamping rollers (23a, 23b) of the second pair of clamping rollers are configured to be individually displaceable sideways transversally to said feeding direction and individually pivotable about a vertical pivot axis (PA2, PA3) during a forming operation, wherein the electronic control device (12) controls the sideways displacement and the pivoting of the clamping rollers (23a, 23b) of the second pair of clamping rollers during a forming operation in such a manner that said second peripheral folding edge (25) is made to follow a fold line (F2, F3) between said web (4a, 4b) and the central flange (2) and in such a manner that the plane (P2) that goes through the centre axes (CA3, CA4) of both clamping rollers (23a, 23b) of the second pair of clamping rollers is always maintained perpendicular to the part of this fold line (F2, F3) that is in contact with the second peripheral folding edge (25).
- A method according to claim 11, characterized in that the vertical pivot axis (PA2) of the clamping roller (23a) provided with the second peripheral folding edge (25) intersects the second peripheral folding edge (25).
- A method according to any of claims 8-12, characterized in that the forming stations comprise a number of first forming stations (20a) and a corresponding number of second forming stations (20b), the first and second forming stations (20a, 20b) being alternately arranged as seen in said feeding direction, wherein the clamping rollers (22a, 22b, 23a, 23b) of each first forming station (20a) fold only the first web (4a) in relation to the first side flange (3a) and in relation to the central flange (2) and wherein the clamping rollers (22a, 22b, 23a, 23b) of each second forming station (20b) fold only the second web (4b) in relation to the second side flange (3b) and in relation to the central flange (2).
- A method according to any of claims 8-13, characterized in that the electronic control device (12) controls the individual movements of the clamping rollers (23a, 23b) of the second pair of clamping rollers and/or the movements of the first pair of clamping rollers (22a, 22b) during a forming operation in such a manner that the point of contact (PC2) between the second peripheral folding edge (25) and the sheet metal strip (5) is always maintained in the same cross-sectional plane through the sheet metal strip (5) as the point of contact (PC1) between the first peripheral folding edge (24) and the sheet metal strip (5).
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19181268.4A EP3753644B1 (en) | 2019-06-19 | 2019-06-19 | Roll-forming machine and method for roll-forming |
PL19181268T PL3753644T3 (en) | 2019-06-19 | 2019-06-19 | Roll-forming machine and method for roll-forming |
ES19181268T ES2895158T3 (en) | 2019-06-19 | 2019-06-19 | Roll Forming Machine and Roll Forming Procedure |
US17/607,104 US11878337B2 (en) | 2019-06-19 | 2020-04-30 | Roll-forming machine and method for roll-forming |
CA3136575A CA3136575A1 (en) | 2019-06-19 | 2020-04-30 | Roll-forming machine and method for roll-forming |
PCT/EP2020/062004 WO2020254023A1 (en) | 2019-06-19 | 2020-04-30 | Roll-forming machine and method for roll-forming |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19181268.4A EP3753644B1 (en) | 2019-06-19 | 2019-06-19 | Roll-forming machine and method for roll-forming |
Publications (2)
Publication Number | Publication Date |
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EP3753644A1 true EP3753644A1 (en) | 2020-12-23 |
EP3753644B1 EP3753644B1 (en) | 2021-09-08 |
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ID=66999608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19181268.4A Active EP3753644B1 (en) | 2019-06-19 | 2019-06-19 | Roll-forming machine and method for roll-forming |
Country Status (6)
Country | Link |
---|---|
US (1) | US11878337B2 (en) |
EP (1) | EP3753644B1 (en) |
CA (1) | CA3136575A1 (en) |
ES (1) | ES2895158T3 (en) |
PL (1) | PL3753644T3 (en) |
WO (1) | WO2020254023A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11745242B2 (en) * | 2018-09-21 | 2023-09-05 | The Bradbury Co., Inc. | Machines to roll-form variable component geometries |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007008152A1 (en) * | 2005-07-11 | 2007-01-18 | Ortic 3D Ab | Roll-forming machine and method for roll-forming a hat-shaped profile |
DE102007059439B3 (en) * | 2007-12-10 | 2009-04-02 | Data M Software Gmbh | Apparatus and method for cold rolling profiling of variable height profiles |
US8763438B2 (en) * | 2009-03-04 | 2014-07-01 | Nippon Steel & Sumitomo Metal Corporation | Working apparatus and working method of sheet metal |
EP3088091A1 (en) * | 2011-12-11 | 2016-11-02 | Ortic 3D AB | Roll-forming method |
US20170203350A1 (en) * | 2015-12-28 | 2017-07-20 | Kawasaki Jukogyo Kabushiki Kaisha | Apparatus for and method of manufacturing roll-formed component having variable width |
-
2019
- 2019-06-19 EP EP19181268.4A patent/EP3753644B1/en active Active
- 2019-06-19 PL PL19181268T patent/PL3753644T3/en unknown
- 2019-06-19 ES ES19181268T patent/ES2895158T3/en active Active
-
2020
- 2020-04-30 WO PCT/EP2020/062004 patent/WO2020254023A1/en active Application Filing
- 2020-04-30 CA CA3136575A patent/CA3136575A1/en active Pending
- 2020-04-30 US US17/607,104 patent/US11878337B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007008152A1 (en) * | 2005-07-11 | 2007-01-18 | Ortic 3D Ab | Roll-forming machine and method for roll-forming a hat-shaped profile |
DE102007059439B3 (en) * | 2007-12-10 | 2009-04-02 | Data M Software Gmbh | Apparatus and method for cold rolling profiling of variable height profiles |
US8763438B2 (en) * | 2009-03-04 | 2014-07-01 | Nippon Steel & Sumitomo Metal Corporation | Working apparatus and working method of sheet metal |
EP3088091A1 (en) * | 2011-12-11 | 2016-11-02 | Ortic 3D AB | Roll-forming method |
US20170203350A1 (en) * | 2015-12-28 | 2017-07-20 | Kawasaki Jukogyo Kabushiki Kaisha | Apparatus for and method of manufacturing roll-formed component having variable width |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11745242B2 (en) * | 2018-09-21 | 2023-09-05 | The Bradbury Co., Inc. | Machines to roll-form variable component geometries |
Also Published As
Publication number | Publication date |
---|---|
US20220226877A1 (en) | 2022-07-21 |
CA3136575A1 (en) | 2020-12-24 |
PL3753644T3 (en) | 2022-01-24 |
WO2020254023A1 (en) | 2020-12-24 |
US11878337B2 (en) | 2024-01-23 |
EP3753644B1 (en) | 2021-09-08 |
ES2895158T3 (en) | 2022-02-17 |
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